4. Maintenance & Inspection
4.1
General
Inspection
Rule
s
Conduct
Periodic
Inspe
c
tion
for
Your
Safety
.
The functions
of
engine components will
degenerate and engine performance will
drop
according
to
the use
of
the
engine.
If
countermeasures are
not
taken, you may
encounter unexpected troubles while
cruising at sea. Consumption
of
fuel
or
lube oil may
become
excessive and
exhaust gas and engine noise may
increase. These all shorten
the
life
of
the
engine. Dally and periodic inspection and
servicing increase your safety
at
sea.
Inspect
Before
Starting.
Make
it
a daily rule
to
inspect before
starting.
(See 3.3.1)
Peri
odic
Inspe
ctio
ns
at
Fixed
Interval
s.
Periodic inspections
must
be
made
after
every
50, 150, 300 and 600 hours
of
use.
Conduct periodic inspections according
to
the procedures described in this Operation
Manual.
U
se
Genuine
Parts
.
Be
sure
to
use genuine parts for
consum-
able and replacement parts. Use
of
other
parts will reduce engine performance and
shorten the life
of
the
engine.
Consult
Your
YANMAR
Dealer
or
Distributor
.
Specialized technicians are ready
to
assist
you with periodic inspections and mainte-
nance. Consult your YANMAR dealer
or
distributor in accordance with
the
service
agreement.
Servicing
To
o
ls
Prepare servicing tools onboard
to
be
ready
for
inspecting and servicing the
engine and other equipment.
Tightening
Torque
of
Bolts
&
Nuts
Over-tightening
of
bolts
and nuts causes
them
to
come
off
or
their threads
to
be
damaged. Insufficient tightening causes oil
leakage from the installation face
or
troubles
due
to
the loosening
of
bolts.
Bolts and nuts
must
be
tightened
to
the
appropr
iate tightenmg torque. Important
parts
must
be
tightened with a torque
wrench
to
the correct tightening torque
and in the right order. Consult with your
dealer
or
distributor
if
the servicing
requires the removal
of
such parts.
The standard tightening
torque
for
standard bolts & nuts is listed below.
r
Apply
the
following
tightening
torque
to
bolts
having
"7"
on
the
head
. (
JIS
strength
classification:
1n
T
ig
hten
bolts
with
no "7"
mark
to
60
%
tighten
i
ng
torque
.
If
the
parts
to
be
tightened
are
made
from
light
alloy
aluminum,
ti
ghten
the
bolts
to
80
%
tightening
torque
.
Bolt dia. x pitch
mm
M6x1.0
M8
x1.25 M10x1.5
M1
2x1.75 M14x1.5 M16x1
.5
Tightening torque Nm
11
±
01
26 ± 03 50 ± 05 90 ± 1 0 140 ± 15 230 ± 20
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34
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